Does your service actually need to have an incredible uptime? What would be the worst that would happen if the service was down let say 24 hours? I feel like w

Does your service actually need to have an incredible uptime? What would be the worst that would happen if the service was down let say 24 hours? I feel like we over engineer that part. Sure there's plenty of service where you don't want any downtime and it makes sense to over engineer it (like any monitoring service) but for many SaaS, the worst that will happens is a few emails. Maybe write a simple SLA, something with a 8 hours response over theses kinds of outage. If some client require more, than sell them a better SLA at an higher cost. That should let you invest into better response time for sure.